What is Cadastre?

Legal Definition
A cadastre (also spelled cadaster), using a cadastral survey or cadastral map, is a comprehensive register of the real estate or real property's metes-and-bounds of a country.

In most countries, legal systems have developed around the original administrative systems and use the cadastre to define the dimensions and location of land parcels described in legal documentation. The cadastre is a fundamental source of data in disputes and lawsuits between landowners.

In the United States, Cadastral Survey within the Bureau of Land Management (BLM) maintains records of all public lands. Such surveys often require detailed investigation of the history of land use, legal accounts, and other documents.
-- Wikipedia
Legal Definition
A term derived from the French, which has been adopted in Louisiana, and which signifies the official statement of the quantity and value of real property in any district, made for the purpose of justly apportioning the taxes payable on such property. 3 Am. St. Pap. 679; 12 Pet. 428, n.
-- Bouviers Law Dictionary
Legal Definition
In Spanish law. An official statement of the quantity and value of real property in any district, made for the purpose of justly apportioning the taxes payable on such property. 12 Pet 428, note.
-- Black's Law Dictionary